Home › Rivers › Hobson's Brook

Hobson's Brook

A stream near Grantchester, Cambridgeshire. No gauge of its own: what the river map and the banked data say about it.

Hobson's Brook is a stream on Ordnance Survey’s river map near Grantchester, Cambridgeshire, with about 1.8 km of mapped channel. On the map it flows into Hobson's Conduit, which flows on into Jesus Ditch, then the River Cam, then the River Great Ouse, then Relief Channel, then the River Great Ouse and out to the sea.

Next gauge downstream

Cambridge Baits Bite on the River Cam, about 9.0 km along the river below where Hobson's Brook ends on the map.

No recent reading (last 4 h ago)

After that, Soham Lode, about 26 km along the river.

No gauge measures Hobson's Brook itself. A gauge downstream shows water that has already passed it, mixed with everything else that has joined on the way, so it says nothing exact about this stream.

Water-sampling points on Hobson's Brook

2 Environment Agency sampling points are placed on this stream. These are dated samples taken by hand, not live readings, and FloodRadar does not grade them.

Hobsons Brook tributary of Cam Road Bridge Long Road
Last sampled 7 Sep 2026 · 24 days ago · 34 samples banked
A1134 Long Road
Last sampled 1 Dec 2025 · 10 months ago · 24 samples banked

A sample is taken on a date; it says nothing about the water today. A sample below an overflow does not by itself show where anything in it came from.

Water samples: Environment Agency Water Quality Archive, © Environment Agency and/or database right 2026, Open Government Licence v3.0.

On the map

The map needs JavaScript. Everything it shows is listed on this page.

The blue line is Hobson's Brook; grey lines are other mapped watercourses. Lines from OS Open Rivers (edition 2026-04).

CB2 8AR, a postcode page near where it ends on the map (about 60 m away) →All rivers with gauges →

What this page can and cannot tell you

Its line, its name and where it flows come from Ordnance Survey’s river map (OS Open Rivers, edition 2026-04), which leaves out many small streams, ditches and culverts. “Flows into” is the map’s word: a channel that is not on the map is not shown here, which does not mean it is not there.
No gauge measures Hobson's Brook itself, so its own level is not known here.
No storm overflow is placed on this stream on the river map. That is not the same as none: the map cannot place every overflow.
Water samples are England’s only (the Environment Agency’s archive), placed where the map can place their sampling point.
Nothing on this page says whether any place floods. For an address, see its postcode page.

This uses Environment Agency flood and river level data from the real-time data API (Beta). Licence: Open Government Licence v3.0.